Pump.



C. D. HILL.

PUMP.

APPLICATION FILED JAN. 41912.

Patented Sept. 9, 1913.

. coLuMBxA PLANUGRAPH c0.,WAsHlNa'roN. D'. c.

CHARLES n. HILL, OF ROCHESTER, NEW YORK, AssicrNOR TO'JUDL a LRLAND iure.

c'O.,:OF CLIFTON SPRINGS, NEW YORK, A CORPORATION OF -Nnw'iroRK.

PUMP.

" To all whom 'it may concern Be it known that I, CHARLEs D. HILL,`-of

yltochester, in the county of-` Monroe and State of New York, have invented -a new and useful Improvement' in Pumps, which improvement is fully Vset 'forth in vthe fol lowing specification and shown in the ac'- companying drawings.

I The present invention relates t-o air pumps Aand more particularly tothattype in which a' plurality of communicating cylinders of different sizes is employed .for the purpose of effecting a greater v.compression of the air; and an Object of the invention is to provide a construction in which the method vof assembling its parts has been simplified so that the time required for suchy assembling is reduced to a minimum, thus reducingthe cost of manufacture of the pump. i

"To theseV and other 'ends' the invention consists in certain parts and combinations ot partsall of whichwill behereinafter described, the novel features being pointedout inthe appended claims.

In the drawings: Figure 1 is a side view of a lpump constructed in accordance with this invention; Fig. 2 is'an enlarged section on the line ct- 1; Fig. 3 is an enlarged section on the line b-b of Fig.- l; Fig. 4L is a vertical section throughthe upper part of two cylinders on the line c--c of Fig. 3; Fig. 5 is a'vertical section on line cZ-dof Fig. 3; and Fig. 6 is an enlarged vertical section through the base on a line @4e of Fig. 2.

In tion there arel employed three cylinders .'1, 2 and 3 which are supported at their lower ends onl a ycommon base 1. yThe base is preferably' Aformed midway `between its ends with an upstandingboss 5 having in this instance three sockets 6,7 and 8.- The upper por tions of the walls of these sockets are preferably internally threaded katA 9 and, below the threaded portion, are provided with annular grooves -10 the lower walls of'which are inclined downwardly and project vin-v wardly beyond the threaded portion to provide shoulders 11. The lower ends of the cylinders l, 2 and 3 areexternally threadedr vand Vengage the threaded walls of the sockthe present embodiment of the inveni that`vv the endsiofvthe cylindersmay reach spcification of Letters'maine"f Patnidhphll. i f

the shoulders 11, foritfmust' -be apparent*` that threads could not be oundon the walls of the* sockets in'yclose proximity to the shoulders. Thefbasee may alsoA serveltoV establish communication between the; cylinders 1 and 2,.an`d,t0fthis end, said base is provided with a 2port12 rconnecting' 'the sockets 6 and 7.. A port 13 may alsolead` from the socket 8 to a nipple 14 to which thel iieXible .piping 15is connected.- The Aupper ends ofthe cylinders may beconnected by a tievpiece 16 having three openings whose diameters correspond with the external `diameters of the cylinders, in order that said tie piece may fit tightly about the' cyl# inder walls, being soldered or otherwise secured thereto. This tie piece may also serve to establish connection vbetween the upper ends vof two of the cylinders and to: this end the internalwalls of theopenings, -through which two of the cylinders pass, yare provided with annular grooves 17 and 18 con# nected by a port 19 and r-espectively-'cOm-- municating with ports 20 and 21 provided 1n the cylinders 2 and 3. Y

It is'apparent that airfrom the cylinder 2 passes, by vway of port 20, to groove 17,

vthence through port 19 to groove 18, and,

from the latter, through port 21 into cylinderB.L 'With a communication, of the type described, between the upper ends `of the l `two cylinders 2 and 3, it is unnecessary that the ports 20 and 21 shall occupy any definite relative positions. rFhis permits the use of with the base d, and said cylinders ymay be turned von the b as'e until they haveA been h Vscrew threads for.- connecting thev cylinder 'i firmly and tightly secured thereto without `taking into consideration the positions of their upper` ends.

The upper Vends yoi? the cylinders maybe closed by plugs 22 having packing glands 23. through which the piston rods 2-1- operate, said' rods having their upper ends con. nectedbyaa single handle'25, The pistons j 'i loo 26, 27 and 28, provided respectivelyinithe within their cylincylinders 1-,2 and"3,are`preferably .formed 5 of leather cups`.acting in one directionto compress air and inthe other Adirection to'105 c ders on the downward stroke, while the L' Vpiston 2 7 comp-ressesthe air within kits cylinder on theY upper stroke-,rg0 that the 'piston l Y bottoms. ofthe c 27 acts in a direction opposite to that lof the pistons 26 and 28.

p Withinthe' depressionsof the base, 4f may be provided centrally arranged bosses v9 which project upwardly in order to coperate with the ends `8O of the piston rods pro-r` jecting from the pistons. This arrangement prevents the operator A ofthe .pump moving the pistons so :far downwardly within -the- Acylinders that, saidYpisto-ns will engageth'e ompression chambers and injure said pistons. f Y Y Itis apparent that air, drawn inthe upper end of t-he cylinder 1 through the port 31, will pass below the piston 26 upon-the upward'movement of the latter,.so that, on the downward movement of the piston, air will be forced bysaid piston through the port 12 into cylinder 2 and past the piston 27. k1Upon the next upstroke of the. pistons, the

- piston 27 will force the air from the cylinder 2 into the cylinder 3 at the upper end of the latter,vand past piston 28 by way of port 19, so that upon the downward movement of the pistons,'the piston 28 will force the air from the nipple 14. Of course, as the air passes from one cylinder to another it` 'becomes more highly compressed.

Freni the foregoing it will be seen that there has been provided a structure which is strong and durablein use and may be manufacturedvery economically. The labor of .assembling the parts 1s reduced to a minlmum, as it is not necessary to accurately locate thev cylinders in any definite positions.

Air tight joints between the cylinders and v"base and a pair of cylinders attachable i thereto by a rotary movement, said cylinders being provided with ports neartheirupper ends, of oppositely-acting pistons in said- Ycylinders connected ltogether for 'simulta` neous movement, and a tie piece about the L cylinders at the ports, saidtie piece 'having internal grooves communicating with the ports and witheach. other.` Y

l 3. In an air pump,the combination with base having three sockets, two of which communicate with each other and a discharge nipple communicating with the other socket through saidbase, of three cylinders of different' diameters having screw threaded engagement with the inner walls of the sockets, all of'said cylinders having ports near their upper ends, a tie piece having separate openings each receiving one of said cylinders, the walls of two; ofthe openings-being provided `with grooves which communicate with each other and` with1 the ports in the two cylin-V ders, the yportof thel other cylinder being' `open to theV atmosphere, cup shaped pistons operating in the cylinders, one of said pistons acting in a direction opposite to. the others, and a handle common to all of the pistons. Y Y Y 11. in an air pump, the combination with a base having sockets therein, the inner walls .of said sockets being.V provided with screw threads near their outer ends, Vand grooves below the screw threads, the lower wall of each groove being inclineddownwardly and projected inwardly beyond the screw '.threads, of `cylinders engaging the screw threads and the inclined walls, Ypistons oper-V o ating in the cylinders, and common operating means for the pistons. o

5. In apump, the combination with a base having a socket internally threaded nearits outer end and provided with a groove below the socket, the lower wallof the lgroove being inclined downwardly and.

.projecting inwardly beyond the screw threads, of anexternally threaded cylinder engaging the threads of the socket andv having its end abutting the lowerwall of the groove, and a piston operating in the cylinder.

6. In a pump, the combination with a base Y having sockets therein and centrally. a r ranged bosses projecting upwardly within vthe sockets, the walls of the socketsbeing provided with screw't-hreads near their outer` ends and grooves below thev threads, the Vlower wall of each groove being inclined downwardly and projectedinwardly beyond the screwthreads andvabovethe upper ends of the bosses, and the base having ports leading from the sockets above the bottoms of the latter but below the upper ends of the bosses, Vof cylinders engaging the Yscrew threads and havingtheir lowerends abutting the inclined walls, pistons operating in thecylinders, and common operating means for the pistons.- f y. Y

f f CHARLES D. yHILL. o Y Y Vitnesses:Y y

HAROLD H. SIMMS, 1 r ADA M. WHITMORE.

' Gop'es of this patent may beobtained for ve cents each,'by addressingithe Commissioner of Patents,

Y Y v .Washington1 D40. Y 

